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ADSL is a newly standardizedgif transmission technology facilitating simultaneous use of normal telephone services, data transmission of 6 Mbit/s in the downstream and Basic-rate Access (BRA).

ADSL can be seen as a FDM system in which the available bandwidth of a single copper-loop is divided into three parts. See figure gif. The baseband occupied by POTS is split from the data channels by using a method which guarantees POTS services in the case of ADSL-system failure (eg. passive filters).

Figure: Frequency Spectrum of ADSL

Kimmo K. Saarela
Mon Mar 6 12:47:27 EET 1995